package com.youuvs.filters;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.core.Ordered;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Date;

public class RequestTimeFilter implements GatewayFilter, Ordered {

    //开启日志打印
    private static final Logger log = LoggerFactory.getLogger(RequestTimeFilter.class);


    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //打印路径 exchange:请求的上下文对象  chain：filter调用链对象
        String path = exchange.getRequest().getURI().getPath();
        log.info("请求路径为：{}",path);


        //开始时间
        exchange.getAttributes().put("startTime",new Date().getTime());

        //执行完成的时间
        return chain.filter(exchange).then(
                Mono.fromRunnable(() -> {
                    //开始时间
                    Long startTime = exchange.getAttribute("startTime");
                    //结束时间
                    Long endTime=(System.currentTimeMillis() - startTime);
                    if (startTime != null) {
                        log.info(exchange.getRequest().getURI().getRawPath() + ": " + endTime + "ms");
                    }
                })
        );

    }

    @Override
    public int getOrder() {
        return 0;
    }
}
